基于复合抛物面集光器的LED教室灯具的配光设计

为了对LED教室灯具配光，建立了复合抛物面集光器配光系统。分析了LED光源发光特性，阐明了对LED光源进行二次配光的必要性。建立了三维复合抛物面集光器（CPC）模型，并由边缘光线原理计算得出三维复合抛物面集光器（CPC）模型各参数与最大出射半角m的关系，分析了m的制约因素。由阅读灯照度均匀度要求，确定了复合抛物面集光器（CPC）模型各参数的值，在光学分析软件Tracepro中建立了CPC模型，将LED光源置于其焦平面上，结合教室桌面与灯具距离，模拟了基于CPC配光的LED教室灯具的照度分布。试验结果表明，CPC配光系统最大出光半角为30时，光照均匀度超过0.7，满足建筑照明设计标准 GB 50034 2004对阅读照明的要求，该灯具有效光通可达95%以上。

Light distribution design of LED lamps in classroom based on compound parabolic collector

A compound parabolic collector light distribution system was established for light distribution of LED lamps in the classroom．First the characteristics of the LED light source were analyzed, as well as the necessity of the secondary light distribution for the LED light source. The 3D nonimaging optics compound parabolic collector (CPC) model was established. The relationship between its parameters and the maximum exit half angle θm was calculated by the edge light  principle and the restricting factors of θm were given．Then the values of all parameters of CPC model were determined according to the reading lamp illumination uniformity requirements, the CPC model was built in the optical analysis software Tracepro.The LED light source was placed on the focal plane of CPC model and the LED classroom lighting illumination distribution based on CPC was simulated combining with classroom desktop and the lamp distance．Results showed that the light uniformity cound reach more than 0.7 and satisfy the building lighting design standard GB 50034-2004 for reading lighting requirements as θm was greater than 30°, the effective optical flux was more than 95%.